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accuracy accurate air speed air-speed aircraft airplane airport airway aviator azimuth beacon bearing bubble celestial avigation celestial sphere Chap chart chronometer circle clouds compass course course and distance dead reckoning dead-reckoning position declination determined deviation diagram direction drift earth east equator error flying give given Greenwich civil Greenwich hour angle Greenwich sidereal ground speed heading heavenly body horizon indicator instrument isobars knots latitude light Line of Position log sec longitude m.p.h. Wind corr magnetic course marked Mercator Mercator chart meridian method Nautical Almanac nautical miles observed pilot plane plotter plotting pole Position Book practical radio reading right ascension scale sextant shown in Fig signals solution Star Altitude Curves steer Table tion track course Track speed triangle true course U. S. Naval Observatory variation velocity vernal equinox vertical watch weather wind angle wind correction